Hi, this is common for fluid trainers.
As the fluid warms, the resistance changes.
My cycleops fluid2 have the opposite behaviour: the resistance goes up (a lot) after it is warmed up.
The resistance also keeps changing with efforts. On long intervals I can clearly see my speed/cadence going down because the resistance is going up. It’s a little annoying because sometimes I have to change gears in the middle of interval.
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